Shockproof gauge mounting



May 31, 1949' A. H. JoNEs 2,471,961

snocKPnooF GAUGE MQUNTING Filed May 19, 1944 Patented May 31, 1949UNITED STATES NT OFFICE This invention relates to devices for gaging thedimensions of work, and has especial reference to devices with which thesizes or dimensions of the work are determined by the Go and No Gomethod.

The principal object of the invention is the provision of a device ofthe indicated character which eliminates injury to the gaging means intesting work for size or diameter, so as to insure accuracy regardingdimensions, and also to prolong the life and usefulness of the device.

With the foregoing, other objects of the invention will appear when thefollowing specification is read in connection with the accompanyingdrawing, in which- Fig. 1 is a side view, partly in section of a d-eviceembodying the features of the invention.

Fig. 2 is a top plan view.

Fig. 3 is an enlarged sectional view taken on the line 3-3 of Fig. 1.

Fig. 4 is a perspective View of the gage element per se.

Fig. 5 is a side view of the gage element illustrating the manner inwhich the outside diameter of work is tested or measured.

Fig. 6 is a longitudinal sectional view of a modified form of deviceembodying the features of the invention for testing work as to insidediameter, such work also being shown in section.

The device includes a gage element I Il which is designed and adapted togage the outside diameter of work through and by Virtue of a Go size anda No Go size method. The gage element I0 consists of a metal body of Ushape, or, in other words, the body is bifurcated and the furcationsconstitute jaws I! spaced apart directly opposite each other. The jaws II present pairs of opposing faces I2-I2 and I3-I3, respectively. Thefaces Iii-I2 are parallel to each other as'are the faces I 3--I3, andthe latter are below' the former. The faces I2-I2 are spaced apredetermined distance and this distance is greater than thepredetermined distance between the faces I3-I3. The difference may beany amount according to the tolerances specified, such as a .001 of aninch. This. provides shoulders Ill- I4 which are greatly exaggerated inthe drawings for the sake of clearness. The gaging faces I2--l2determine the Go dimension which is the first or larger diameter,whereas the gaging 2 Claims. (Cl. 33-168) jected as being unsatisfactoryor not of the specified outside diameter.

I-Ieretofore, a snap gage of the type described may be subjected toexcessive force by careless users with the result the gage is damaged tothe extent that it loses its accuracy.

In accordance with the present invention, the gage element Il] issupported or mounted in such manner it will yield when subjected todetrimental and injurious force in using the device, thereby prolongingthe life and usefulness of the same. A holder I5 is provided, consistingof similar side plates I6 and spacing bars I l. The plates I6 aresecured to the bars I1 on opposite sides, respectively, by screws I8,and the bars themselves are in spaced relation to each other to form aguide in which the gage element I0 may slide up and down. Each plate I 6has a rectangular notch I9 in the upper end to provide clearance for thework and an abutment 20 to stop the downward movement of the work whilebeing gaged. The bars Il are longer than the -plates I6 so that thelower ends of the bars may `extend into holes in a base block 2| withthe lower edges of the plates I6 in contact with the upper surface ofsaid block. Screws 22 are driven into tapped holes in the lower ends ofthe bars I1, respectively, the block also being drilled for thispurpose. The gage element IIJ is under the influence of one or morecompression springs, there being two such springs 23 in the presentinstance. Each spring carries a headed rod 24 at its upper end to keepthe spring from bending laterally. The lower end of each spring isreceived in a socket 25 in the block ZI. The head end of each of therods 24 bears against the underside of the gage element I0. The springs23, therefore, constantly urge the gage element upwardly. The upwardmovement of the gage element is limited by stops 26 in the form of pinson the spacer bars Il, respectively. In the normal up position of thegage element the open end thereof is uppermost and the jaws II areexposed at the notches I9.

From the foregoing, it will be apparent that in gaging a piece of workto determine its outside diameter, should said piece be oversize asindicated at 2l in Fig. 5, the piece will bear on the upper ends of thejaws II. If excessive and injuricus pressure is applied, the gageelement I0 will move downwardly to relieve the gage element. Also, if apiece of work, as indicated at 28 in Fig. 5, enters the Go and is keptfrom entering the No Go by the shoulders I4, the gage element will movedownwardly under any excessive pressure. In this case, however, thepiece 28 is of the specified diameter, yet the user may be subjectingthe gage element to a damaging force. As the gage element I movesdownwardly in each operation, the work piece will encounter theabutments 2U, thereby preventing any abuse of the gage element which hasyielded and so been relieved. Again, if a Work piece, as indicated at29, enters the No Go it will encounter the abutments which may becoincidental with the bottom of the No Go or slightly below the same. AWork piece entering the No Go is rejected as being less than therequired diameter as will be understood. The springs 23 return the gageelement to its normal up position and are of such strength that they arecompressed if the work does not enter the gage element without forceeven though there is a snug feel in the case of close tolerances.

In Fig. 6 there is shown a modied device having the features of theinvention for gaging inside diameters. This device includes ventedtubular holder 30, a Go gage member 3| and a No Go gage member 32. Themembers 3| and.32 are cylindrical, and the member 3| is smaller indiameter than the diameter of the member 32. A compression spring 33 isarranged within the holder with its opposite ends in contact with theinner ends, respectively, of the members. Each gage member normallyprojects beyond the holder and the outward movement to the projectedposition is limited by a stop pin 34 on the holder 30, the pinprojecting into a longitudinal groove 35 in the gage member. It isobvious that should the No Go member 32 be larger in diameter than thehole 36 in the work 31 the member 32, under pressure of the usergrasping the holder 3D and pushing the member 32 against the work, themember 32 will move into the holder 30. Also, if the Go member 3l shouldbe larger than the hole 3B, the member 3| will yield. If the Go member3| enters the hole 36' freely or even with a snug feel the hole is ofthe specied diameter.

From the foregoing, it will be apparent the de- 4 vice is one by whichthe objects of the invention may be attained.

I claim:

1. A work gage comprising a frame, a gaging member slidable outwardlyand inwardly with respect to the frame, said gaging member beingbifurcated and having two pairs of opposed parallel work contact facesconsisting of an outer pair and an inner pair, the distance between theouter pair of contact faces being greater than the distance between theinner pair of contact faces, corresponding faces being joined to provideshoulders intervening said pairs, resilient means constantly urging thegaging member outwardly and allowing .it to slide inwardly, meanslimiting the outward sliding movement of the gaging member into a gaglngposition in which to receive Work for a gaging operation, and anabutment on the frame which will be engaged by the work as the gagingmember yields under pressure of the work while it is being gaged,thereby preventing the work from damaging the gaging member.

V2. A work gage as set forth in claim l, wherein both pairs of said workcontact faces are disposed outwardly beyond said abutment when thegaging member is in the gaging position.

ALLAN H. JONES.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 793,628 Bailley June 27, 1995999,141 Anderson July 25, 1911 2,021,201 R005 NOV. 19, 1935 FOREIGNPATENTS Number Country Date 115,057 Australia May 7, 1942 552,340 FranceApr. 28, 1923

